861418660 has 12 divisors (see below), whose sum is σ = 1808979228. Its totient is φ = 344567456.

The previous prime is 861418631. The next prime is 861418667. The reversal of 861418660 is 66814168.

It can be written as a sum of positive squares in 2 ways, for example, as 97891236 + 763527424 = 9894^2 + 27632^2 .

It is not an unprimeable number, because it can be changed into a prime (861418667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21535447 + ... + 21535486.

It is an arithmetic number, because the mean of its divisors is an integer number (150748269).

Almost surely, 2^861418660 is an apocalyptic number.

It is an amenable number.

861418660 is an abundant number, since it is smaller than the sum of its proper divisors (947560568).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

861418660 is a wasteful number, since it uses less digits than its factorization.

861418660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43070942 (or 43070940 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 40.

The square root of 861418660 is about 29349.9345825506. The cubic root of 861418660 is about 951.4911614152.

The spelling of 861418660 in words is "eight hundred sixty-one million, four hundred eighteen thousand, six hundred sixty".